[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fm8E69Xt5FCqACzweXquIrgZy3Ruffn6YMwR2a0tLgnQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-11 15:42:58",260119822,[8,9,10,11],"MOSI、MISO、SSEL、MOSI、MISO、SSEL","MISO、MOSI、SSEL、MISO、MOSI、SSEL","MOSI、SSEL、MISO、MOSI、MISO、SSEL","MISO、SSEL、MOSI、SSEL、MISO、MOSI",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},17,"77cae1fc52621a43b1bcb806a5136a2c","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc315411071507b2cbd91cdb9eaf3dd70.png","嵌入式系统概论","ebeefaf1499143418fbd744551063993","串口单元练习","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff51dd1ab675b131d38502771bdc2055.png\">图中1、2、3、4、5、6分别是",[21,32,41,50,53,62,71,80,89,96],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],260119819,[25,26,27,28],"SPI- 般使用4条信号线: SCK、MISO、 MOSI和SSEL","采用SPI可以构成"一主一从式"系统","采用SP可以构成"一主多从式"系统","采用SPI不能构成"多主多从式"系统","面关于串行外设接口SPI的叙述中,错误的是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],260119820,[36,37,38,39],"ARM芯片中的UART收发信息时 ,可以采用FFO模式,可以采用普通模式","UART传送信息的格式以起始位开始,以停止位结束","UART传送信息时,一次传送的数据位的长度只能是8位","UART可组成RS-232接口","下面是关于UART的叙述,其中错误的是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],260119821,[45,46,47,48],"SPI是一种同步串行外设接口","1个时钟信号SCK控制一位数据传输","一般情况下,SPI接口包含低电平有效的从机选择线","SPI不能实现全双工通信","下面关于SPI的叙述中,错误的是()",{"answer":51,"createTime":5,"id":6,"options":52,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],260119823,[57,58,59,60],"UART是一种同步串行通信外设接口","利用UART进行串行通信时,一方的发送信号的数据线和另一方的接收数据的信号线相连","利用UART可以实现全双工的通信","STM32的中断控制支持UART接口引起的中断","下面关于UART的叙述中,错误的是",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],260119824,[66,67,68,69],"RS-232接口标准采用负逻辑,逻辑0用正电平表示","RS-485采用差分信号传输方式,因此有很强的抗共模干扰能力","在距离10米左右RS-485接口标准和RS-232接口标准的最高通信速率相同","通过RS-485可构成主从式多机通信系统,主机可以采用轮询方式和各从机建立通信链接","下面关于RS-232、RS-485叙述中,错误的是",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],260119825,[75,76,77,78],"0或1","0","2","1","8.​从逻辑角度来说,串行通信的起始位由( )表征",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],260119826,[84,85,86,87],"波特率的提高,位长变小","通信距离短,可以适当提高波特率","波特率的提高,位长变大","把每秒内传送的位数叫做波特率","以下关于波特率的描述中错误的是",{"answer":90,"createTime":5,"id":91,"options":92,"question":95,"source":30,"type":31},[],260119828,[93,94,77,78],"3","4","10.‏两个MCU之间之间进行串行通信连接,各自供电,它们之间通常需要几根连接线",{"answer":97,"createTime":5,"id":98,"options":99,"question":104,"source":30,"type":31},[],260119830,[100,101,102,103],"0V","2V","1V","大于3V","11.‏一个芯片的供电电压为3.3V,发送位"1"时,一般情况下,其TX引脚的电压为"]